http://lea.verou.me/2011/10/easily-keep-gh-pages-in-sync-with-master/
git add .
git status // to see what changes are going to be commited
git commit -m 'Some descriptive commit message'
git push origin master
// Now, when I use gh-pages, there are only a few more commands that I have to use after the above:
git checkout gh-pages // go to the gh-pages branch
git rebase master // bring gh-pages up to date with master
git push origin gh-pages // commit the changes
git checkout master // return to the master branch